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t . <br /> SECOR <br /> May 10, 1999 International Incorporated <br /> Project 7G600-037=02 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environments[Health Department <br /> 304 East Weber Avenue MAY 1 1 199 <br /> Stockton California 95202 i=►'�� 1R0 9 <br /> ' i FIV'IAL_HL_A 7'l--,f <br /> PFRMl T f SFRV1CF'q <br /> Re: Addendum to Work Plan for Soil Sampling during Product Line Upgrade <br /> ARCO Station#434 <br /> 501 W. Kettleman Lane <br /> Lodi, California <br /> Dear Ms. •Lagorio: . <br /> On behalf of ARCO Products Company(ARCO), SECOR International Incorporated- <br /> (SECOR) <br /> ncorporated(SECOR) has prepared this addendum to the letter entitled"Workplan for Soil Sampling <br /> during Product Line Upgrade; dated March 16, 1999. The purpose of this addendum is to <br /> notify the San Joaquin County Environmental Health'Department (SJCEHD) of a change <br /> to the scope of the construction work outlined in the referenced work plan. In addition to <br /> upgrading the product lines, the underground storage tanks (USTs) will also be replaced. <br /> Compliance soil sampling procedures, excavated soil management and limited over- <br /> excavation procedures, and laboratory methods as well as site background are summarized <br /> in the orginal work plan with only the following changes: . <br /> • The area of possible over-excavation shown as a dotted line on Figure 1 in the March. <br /> 16, 1999 work plan is expanded to include the area imediately adjacent to the USTs <br /> (within approximately three feet of the tank complex). The vertical extent of the over- <br /> excavation in the area of the USTs will:be based on the limits of the excavation <br /> equipment, likely 18 to 20 feet below ground surface. Over-excavation,if performed, <br /> will still.be limited to approximately.50 to 200.cubic yards of soil. <br /> • SECOR anticipates initiating field activities during May 1999. <br /> If there are any questions regarding the contents of this work plan,please callus at(916) <br /> 364-1880. <br /> Sincerely, <br /> SECOR International Incorporated <br /> 1 <br /> Rusty E. Benkosky, P <br /> Associate Engineer <br /> cc: Mr. Paul Supple, ARCO Products Company. <br /> Mr. Mark List, RWQCB -Central.Valley Region <br /> 9912 Business Park Drive, Suite 100, Sacramento, CA 95827 (916)364-1880(916)364-1889 FAX MUSecor.com <br />